Automatic drilling-machine.



7 SHEETS-SHEET vl Patented 0@t.16,1917.

C. E. LOYD.

AUTOMATIC DRILLING MACHINE.

APPLICATION FILED Aue. 28, 191e.

AIII ITI II II I III I IIII III Bamm@ OCI. 16,1917.

SHEETS---SHEET 2.

INVENTOR I Clarence Eboyd C. E. LOYD.

AUTOMATIC DRILLING MACHINE.' APPLICATION FILED AUG. 28. 191e.

Patented Oct. 16, 1917.

7 .S HEETS-SHEET 3.

TVITNESSES: INVENTOR Amann-m5.

C.E.LOYU

4 AUTDMTIC DRI-LUNE MACHINE. APPLICATION man Aue. 28, 191s. Y

Patente@ 9ct, L, im?.

'I SHEETS-SHEET 4.

INVENTOR CZCSHCQE/ w mf E?? wlTNEssEs:

UU CWM C. E. LOYD.l AUTOMATIC DRILUNG MACHINE.

APPLICATION FILED AUG. 28. 19l6.

1,243,616L Pa'tented 0st. 16,1911?.

C. E. LOYD.

AUTOMATIC DRILLING MACHINE.

APPLICATION FILED AUG. 2B, |916. ,243,61 6. Patented oet. 16,191?.

SHEETS--SHEET 6.

C. E. LOYD.

AUTOMATIC DRILLINGV MACHINE.

APPLICATION FILED AUG. 2B. |916.

gl 6., Patented ont. 16, 1917.

SHEETS-SHEET 7- I u MW I IIIIIIIIIIIIInlillm'nlmmnll v/ 16% M. I

fw?? fw/MJ '-mm l v IIIIIII @ww/ f7 7' Tax/vers.

CZareWc'eE-Lqyd,

CLARENCEKE. LOYD, OF LOS ANGELES, CALIFORNIA.

:AUTOIVIAIIGV DRILLING-MACHI E.

Specification of Letters Patent.

patented Oct. t6, i917.

Application ined August 2s, 191e. serial No. 117,290.

To @ZZ whom t may concern.'

Be it known that I, CLARENCE E. Loro, a citizen of theUnited States, residing at Los Angeles7 in the county of Los Angeles and State of California7 have invented new and useful Improvements in Automatic Drilling- Machines7 of which the following is a specilication.

This invention rela-tes to an automatic drilling machine and particularly pertains to a machine adapted to bore holes in sash members for the reception of dowel pins with which said members are held together when assembled.

lt is'an object of this invention to provide a machine which will alternate-ly operate upon the rails and stiles of sash to bore dowel holes in the endsy of the rails and at suitable points upon the sides of the stiles, in an automatic manner.

Another object is to provide a simple means for alternately feeding the rails and stiles from separate feed racks to the drills and sin'niltaneouslyY moving the previously drilled members away from the drilling position and out of the machine.

Another object is to provide feed means for withdrawing the lowermost sash member from vits rack and positioning it in drilling relation to the drill bits without causing theremaining sash members within the feed racks to forcefully fall the width of the member removed, and thereby eliminating the possibilityY of the members becoming dented .or otherwise damaged by the fall.

Another object is to provide simple means for alternately reciprocating the drill vbits on a horizontal plane and at right angles to each other so that the movement of said bits will be in synchromism with the alternate feed of the rails and stiles.

Another object is to provide simple adjustable means wherebyy the sash members will be positively held against upward movement while being acted upon by the drills and will be readily released therefrom when ejected by the ejecting mechanism.

It is another object to construct adjustable means whereby the position of the drill holes formed in the sash members may be varied throughout a suitable rangeof adjustable movement.

Another object is to provide simple adjustable means for regulating the effective boring stroke of the drill bits.

It is another object to provide one of the drilling units with horizontal adjustment so that sash members of various lengths can be accommodated.

It is a further object to provide means for accomplishing the above results in a simple and worlnnanlike manner and by a machine adapted to operate continuously and automatically from a single source of power.

Other objectswill appear hereinafter.

T he invention is illustrated in the accompanying drawings' in which:

r Figure l is a view in plan illustrating the complete machine as set up for operation and indicating in dotted lines the positions of a sash rail and a stile ready for drilling.

Fig. 2 is a view in front elevation of the complete machine as shown in Fig. l and indicates in dotted lines the horizontal position of the sash members while being drilled.v

Fig. 3 is a. view in section and elevation as seen on the line 3 3 of Fig. l and viewed in the direction indicated by the arrows and discloses the relative positions of the vital parts o-f one unit of the machine.

Fig. et is a diagrammatical view, in perspective with parts broken away and illustrates the arrangement of the drives of the various elements embodied in one unit of the machine. l V

Fig. 5 is an enlarged view similar to Fiom 3 of the drawings and with parts broken away to illustrate two steps in the feed operationof one of the machine units,v the final step being illustrated in solid lines and the initial step illustrated in dotted lines.

Fig. G is a view similar to Fig. 5 with the unessential parts of the machine omitted and illustrates the positiony of the feed members when a rail is being drilled and further illustrates in dotted lines the intermediateposition of the feed members while a stile is being fed to itsk drilling position.

Fig. 7 is a view of one of the drilling units looking in a direction similar to that of F ig. 5 and with parts broken away to more clearly illustrate the driving mechanisni embodied to reciprocate and rotate the drill bits.

F ig. 8 is a view in plan of the drill block operating mechanism provided one of the drilling units and illustrates the essential elements of the mechanism while omitting the bearings and housing therefor.

Fig. 9 is an enlarged view in vertical section as taken through one of the drill blocks and particularly illustrates the drill bit drive and the longitudinal'adjustment provided the bit.

Fig. 10 is a view in vertical section as'seen on the line 10-10 of Fig..9 and as viewed in the direction of the arrows and particularly illustrates the arrangement of the driving gears by which the drill bits are rotated.

Briefly considered, the drilling machine comprises a horizontally disposed bed-plate 15 over and at one end of which is iiXed a drilling unit *A- and slidably mounted on the bed-plate is a movable drilling` unit -B which is identical in all its details to the unit-Arand is arranged so that complementary parts are adjacent each other for the support and drilling of sash members therebetween. ln view of the duplication of the vital parts of the two drilling units, the similar parts will be given like reference numerals wherever they occur throughout the specication.

The bed-plate 15 is formed with parallel ways 1G and 17 which lie horizontally and which are supported upon legs 1S and 19 disposed beneath their opposite ends. The way 17 is graduated along its upper face and enables the operator to set the movable drilling unit -B- for any length of sash. A gear rack 2O is formed along and throughk out the inner edge of the way 17 and enables the drilling unit -B- to be horizontally adjusted by means of a wheel 21 mounted upon a shaft 22 which is adapted to rotate a spur pinion 23 in mesh with the rack 20, rEllis shaft is vertically mounted within a suitable bearing` Q4 upon the main housing Q5 of the drilling unit -B- and 'thereby moves this unit when rotated.

Mounted beneath the bed-plate and rotatably secured withinA suitable bearings upon the legs 13 and 19 is a horizontally extending drive-shaft 26 which is preferably provided with tight and loose Apulleys Q7 and 28 adapted to be rotated by engagement with a driving belt 29 which transmits power from a suitable line-shaft. The driving shaft 26 has a relatively small pulley 30 secured upon one of its ends and on the outside of the leg 19. This pulley conveys power to a larger pulleywheel 31 by nascere means of a belt The belt is frictionally held upon the surfaces of the two pulleys by an idler pulley 33 mounted upon a counterweight lever 34 and vacted upon by a counterweight 35. The pulley wheel 31 is secured at the outer end of a worm gear shaft 36 which ismounted at the end adjacent the pulley within a journal box 37 and extends therethrough to a suitable bearing within the Xed drilling unit A. The driven connections with this shaft will be described hereafter. The opposite end of the drive-shaft 26 is provided with a large pulley wheel 38 which rotates a relatively smaller pulley wheel 39 by means of a belt 40. rlhe pulley wheel 39 is fixed upon one end of a drill bit driving shaft 41 which extends from a suitable bearing 42 upon the housing of the fixed drilling unit A" through a bearing 43 upon the movable housing and terminating, after passing through a bearing 44, .at theend of thebedplate. each other, the shaft 41, however, being positioned above and at the rear of the shaft 36. The shafts 25,- 36, and 41, with their various driving and driven pulleys, constitute the transmission of the machine.

its before stated, the drilling units -A- and -B- are formed of duplicate parts and act in an identical manner and for that reason the description following will refer particularly to the unit -B- as it possesses the added function of being horizontally adjusted. This unit is constructed with a housing 25 Vwhich is adapted to slidably rest upon the ways 16 and 17 andk is The shafts 41 and 36 lie parallel `to secured thereupon by retaining plates 45 and 4G. The main porti-on of the housing is rectangular and contains the driving mechanism required by the stile drilling block 47 and the rail drilling block 48. rlChe drilling blocks 47-and 48 are made in duplicate and are each adapted to move horizontally along parallelrguide-ways 49 'and 50, these pairs of guide-ways being disposed at right angles to eachother within the housing 25. Y

The drilling block 43fis formed witha rectangular body through which the shaft 41 extends and is adapted to rotate. This shaft is fitted with a driving gear 51 which is provided with extending hubv portions adapted to engage the vertical walls -of a recess in the drill block. The gear 51 is )lined upon the shaft 41 and may be moved throughout the length of this shaft upon the movement of the drill block withinof a form ,tocause ythe drill block 48 to ,be advanced' and retracted throi'igh'out a given AStroke by ythe movement of thel roller as it passes along the groove. The cam 57 is suitably Secured upenn parallel jacleshaft 5S which lies 'beneath and in vvertical alinement with the shaft il and is suitablyhoused within the drillingunit housing. T his shaft is adapted to berotated by a transverse counter-Shaft 5) which has a bevel pinion 60 at'one end in mesh `with a lbevel pinion 6l upon the shaft ed; 4The counter-Shaft 59 extends at right angles to thelshaft' 58 and lies across'and abweV the worm wheel Shaft 36 and isdrivenjtlierefrom by 'a worm gear 62 which meshes'with a' worm Awheel 63 upon the transverse Shaft '59, the gear reduction between the worin gears'beingsuiiicient to reducethe Speed of 'travelof 'the drilling blocks so that proper feed may be had for their drilling bits.

The drillingfbloclr 4:7 'is reciprocated by a cylindrical camf securedupon 'the transverse yshaft 59, which cam has a cam groove G5 around its periphery.v The groove ('35 is Similar in shape to the groove 5G upon cam 57 but is positioned in relation to the groove 5G so that'the biocks will reciprocate toward and from the rail and Stile in an alternate manner'. The groove 65, as will be understood7 engages a roller iipon the stud est secured tothe drill'bloclr 47. and thereby reciprocates a Spur driving geant'i within the drilling block. 'The spur gear 66 is similar tothe gear 5l within block e8 and is Splined upon a"transverse'shaft(i7 which passesthrough the drilling bloc'lr and is driven by bevel gears A68" andr G9, the gear G9 being Secured to the" end of theshaft G7 fand the gear GS Vsplined upon the shaft di.

There ris no reduction between gears @Sand 69 and in vieww of the fact thatthe gears 5l and G6 are'ofthe Same diameterthe drive provided ythe drillingfbits 70 andr7 upon the rdrill bloclr`47 and the bits72 and 73 upon the drill block y48 will be .of uniform speed.

The drilling bits are hmizontallyr and rotatably mounted within suitable bearings upon the'top ofy thfedrilling bloclrsfand are demountably secured within a sleeve 7e 'which is adapted topbe longitudinally adjustfe'dby means' offan adjustmentscrew 75 bearing' against/the rear end ofthe sleeve and regulating the stroke ofthe bit within the ysash members.y The bit is held in position within the sleeve by a ySet screw or by fotherf well known meanswhich provides it with lateralfadjustment.' `The `sleeves are` arranged in pairs and' are driven from the gears 51 and'GG 1by means of pinions 77and 78 which are staggered inrelationto each other to enable ythe bits to beoperated'betweenshort centers.

,drilled jby two Sets of alined bits 72 and ihe drill Ablocks i7 and drills 70 and mounted thereupon are adapted to engage and' drill the Stiles 79 ofthe sash as they the Stiles are delivered prior to being drilled.

rl`he Stiles are deliveredto the drilling platn form by means of a feed bar S3 which travels along a horizontal guide-way 84 formed upon the upper face of the drilling unit housing and at right angles to the length ofthe stile. This bar is not secured to the guide-way but bears upon it and is raised and ylowered by a rocker arm 85 to which it is pivotally Secured at its outer end by a pivot pin S6. The rocker arm 85 is formed in the shape of a bent lever and bears along its lower face upon a roller 87, the opposite end of the arm being secured to a wrist pin 88 mounted upon a cam Si) which is secured to the shaft 58. The rocker arm 85 is advanced and retracted by the movement of the wrist pin 88, as the Shaft 58 revolves, and will, due to its peculiar angular relation to the roller 87, effect a reciprocating and aV swingingmotion simultaneously. This motion is utilized to advance the feed bar and the stile supporting pad 90 which vis secured at the outer end of the feed bar and will,l while moving7 force the member 90 against the side of a Stile to' feed it to the drilling platformand thereafter become positioned beneath the-Stiles within the feed racks and mechanically'lower them tothe feed floor without violent shock. The stile fed by the feed bar will be placed upon the drilling 'platform by the end portion of the rocker arm 85 and there left while the rocker arm is retracted and the stile is being drilled. l

The movement of the rocker arm not only acts to feed thel Stiles to a drilling platform but also delivers the rails to theirdrilling platform. The rails, which areof Shorter length 'Y than the Stiles, are positioned between feed racks 91 and 92 which are secured to the housings of the drilling units and P1- and near the rear of the machine, and these rails are adapted to be 7 3. These racks are formed in channel Section andare arranged to allow the rails to be fed horizontally therefrom and iny a direction opposite to the feed of the Stiles. This feed is produced by the return movement of the feed bai` 83 which is fitted at the end opposite from the pad with an'adjustable pressure screw 93 which bears against the edge of therail 91 and forces it out toward the rear of the machine and upon a drilling platform 95. The stroke of the rocker arm is sufficient to exactly place the stile andrail in drilling position before the drilling block.

r1`he rail 9%, when fed to the drilling platform 95, is forced under a resilient adjustable clamping finger 96 which is curved at its outer end and bears with its arcuate face upon the top of the rail and holds it to the drilling platform. To further secure the rail against movement, a rail locking bar 9T is pivoted to the housing upon a pivotal mounting 9Sv and extends beneath the rails so that a lookin g lug 99 formed at the outer end of the bar may be swung upwardly and will engage the inner edge of the rail `during the drilling operation, thus preventing the rail from moving backward and against the rail in the feed rack. The swinging of the locking bar is effected by the cam 89 which is formed with a semi-circular cam face which engages a bearing iino'er 100 extending downwardly from the locking bar and thereagainst. This face is formed with a pause 101 and a swell 102 which extends approximately the length of the camy perim` eter and thereby holds the locking bar in its uppermost position one-half the revolution of the shaft 58. i

' The stile is locked in its drilling position by means of vertically swinging counterweight arms 103 and 104 which are pivoted upon pivot pins 105 and 106 secured within suitable bearings at the rear of the drilling unit housings. These arms are provided with adjustable counterweights 107 which may be slid along the top of the arms to provide proper pressure upon the stile and to act as a counterpoise for the weight of the arm. The stile engaging ends of the'arms are formed withside retaining angles 108, presser plates 108, and end engaging angles 109. These angles extend downwardly and secure the stile against outward movement and against end movement while `being drilled 4and the presser plates hold the stile down upon the drilling platform. The oscillating 4movement of the arms 108 and 104- is afforded by rocher cams 110 which are mounted upon thev shaft 58 and are born against by rollers 111 adjustably secured by means of a threaded mounting 11.9l to an extension arm 113 secured to the under side of the counterweight arm. The cams `110 represent segmental portions of a disk and are or uniform radius so that when they are in engagement with the rollers 111 the arms will be swung downwardly and around the stile.

Then the machine is in operation, the racks 80 and 81 are lled with stiles, one

each of the drilling unit housings, will be c horizontally reciprocated and, we will as- Y sume, will irst engage one of the stiles 79 and force it outwardly upon the drilling platform 82. As the bars S3 engage the stile the pads 90 thereon are raised to a point upon the level of the top' of the stile being fed and will thereafter support the uppermost stile as the lower stile is pushed from beneath it. The rocker arm 85, which is bearing upon the roller 8T, will be raised by means of the pin 88 during this forward movement and will thus swing the outer end of the arm down to deliver the stile to the drilling platform without violent shock. The shaft 58 rotates in the direction indicated by the arrow -cand will begin to retract the feed and rocker bars when the pin 88 has reached the vertical axis of the shaft and further movement will cause the adjustable members 93 upon the rear end of the feed bars 83 to engage one of the rails 94; and force it uponthe drilling platform 95 and beneath the pressure finger 96. Simultaneous with the initial movement of the rocker arm 85 to its retracted position, the segmental cam 110 will'bear against the roller 111 and act upon the arm 113 to swing the counterweight arms downwardly and over the stile Vupon thev drilling platform. After the rocker arm has been retracted and starts forward the cam S9 will act upon the finger 100 of the lock bar 97 to swing the locking lug 99 up into a locked position against the inner-edge of the rail. Thus the rails will be fed and locked and the stiles will be fed and locked in an alternate manner.

The drilling operation of the stiles and rails is effected by the movement ofthe drill blocks l? and t8 in'an alternate manner and so timed as to drill the 4stile while the rocker arm is retracting and forcing a rail into drilling positionrand to drill t-he rail while the rocker arm ismoving forward to feed another stile to its drillingfplatform. the two sets of cylindrical cams 57 and ,64E

which alternately reciprocate to producetheV correlation above described.,V 1t is apparent that the movement of the work ony to the drilling platforms will shove the finished pieces out of the machine and on to a suitable raclr provided therefor.

1t will thus be seen that the drilling machine set forth and described in the drawings and foregoing specification will act in rlhis is accomplished by means of 4. A machine a continuous automatic manner to alternately feed and drill stiles and railsv of window sashes in an accuratefmanner sot-hat they may be readily assembled and doweled. f

l claim:

l. ln a machine 'for drilling, dowel holes in sash members, a supporting frame, a pair of housings on said frame, a drill in each of said housings extending toward each other, a second drill in said housings arranged at right angles tok therst-named drills, means for advancing and retracting said drills, and reciprocating means for automatically interposingl a piece of work in the path or' travel rof the first-named drills when moving` in one direction and forplacing anotherpiece of work in front of the second drills 4when moving in the opposite direction. Y n

Q .ln a machine for drillinglholes in sash members, a frame, a pairof housings on said rame,-means for adjusting one of said housings in relation tothe otherA on said trame, a group of drills in each of said housings arranged to oppose a group 'of-drills in the other, a lsecond group of drills iny each housing at right angles tothe drills in the other group, means-:tor rotating said drills, means for advancing and retracting ,said drills.and reciprocal means for automaticallyifeeding work alternately between and at the side of said housings and interposing itin the path of travel kof said drills.

3.*ln a machine for drilling dowel holes in `sash members, complementary `sets of spaced alined bits, a pair of sets of parallel bits at right angles thereto, means for rotating said bits, means for advancing and retracting the sets of alined and parallel bits, a pairy of sets of guide raclsfor the work, and reciprocal means Jfor Adelivering the work from one of said sets of racks and disposing it into Ithe path of travel of one of ythe two sets of drills,-and for delivering the work from the other set of racks into the path of travel of the other setof drills.

for boring two pieces of work on the ends and the faces, respectively, of alined `bits yspaced thereto and spaced apart less than the length of the work to be bored on the face, and means for reciprocating said bits, feed racks forthe respective pieces ofworl, stacking themparallel to the alined bits and to each other, .f a common reciproca-ting means feed- .inga piece of work from one rackv into a position between and iny alinement with the alined' bits, and to feed a piece of work ,from the other rack toda position transverse toandopposite to the other bits.

5. In a ymachine for drilling. dowel holes in sashmembers, thecombination of a pair of yalined drills, setsot .parallel drills arrangedat right angles to the alined drills, vertical guide racks forthe work, a pair of horizontally reciprocal and parallel feed bars having engaging members extending upward and between the bases of said racks, said feed. bars extending in the direction of the parallel drills, means for reciprocating said bars simultaneously lwhereby the work will beialternately.discharged from said racks in oppositel directions, onev piece of work being disposed between the alined drills, andthe other at right angles to the parallel drills, in the path of travel of said drills, and means for reciprocating said drills whereby holes will be formed in ends of one ot' the pieces oiworlr and in the vsides or' the other pieces'of work.

-6. The combination of a horizontally eX- tending drill, means/for rotating said drill, means for reciprocating said drill intermittently, a feed-bar extending parallel with said drilll adapted to yengage and advance the work, means for reciprocating: said feedbar intermittently and alternately with the reciprocation of the drill, ak pair of rocker arms arranged to rock` in a direction at right angles tofthe direction of reciprocal movement-of` the drill andYeed-bar, meansfor advancing said arms on the rearward movement of the feed-bar to move same int-o engagement ,with the work advanced by the feed-bar whereby the kwork is held against movement during the reciprocation of the drill, and means for automatically retract- 4ing said` arms to release the work on the advanced movement of the feed-bar.

. 7. The combination of a horizontally eX- tending drill, means for, rotating same, means for reciprocating said drill intermittently, a feed-bar extending parallel with said drill adapted to engage and advancea pieceof work, means for intermittently reciprocating said feed-bar alternately with the reciprocation of the drill, a pair of rocker arms arranged to rock at right angles to the drill and feed-bar, means on sait rocker arms for `engaging the ends of a `piece of work, means for normally maintaining said rocker arms in a retracted position, and means operable onA the retraction of the feed-bar for advancingthe rocker arms and the Vwork engaging means Lthereon into engagement with the work1 whereby the latter is held against movement during the reciprocation or the drill.

` 8. ln a machine of they class ,describech a pair of shafts arranged at right angles to each other, gears feathered on said shafts to shift longitudinally thereof,carriages engaging saidgears, a drill spindle4 mounted kon each of said carriages, gears onsaid spindles meshing with the gears on the shafts, a second;` pair of shaftsy extendingI parallel with the iirst-,named shafts, cams on said last-named shafts having peripheral grooves, membersv on said carriages extending into the grooves on said cams, and means for ro-V drills alongside of said housings, and means for adjusting the position of the housings in relation to each other to vary the space betweenV the `alined drills and' the parallel drills. Y

10. InV a machine for drilling dowel holes in sash'members, a supporting frame, a pair ofhousings onv said frame, sets of drillsv operatively mounted within said housings, vertical feed racks secured to the housings, a drilling platform adjacent the feed racks, a feed bar for moving a sash member from the bottom'of the feed racks to the drilling platform and lowering the stack, a rocker arm for raising and lowering and reciprocating theY feed bar, counterweighted arms pivoted at the rear of the housings and having presser plates to engage on top of the sash member and angles to engage the ends and sides and hold theY sashinember securely upon the drilling platform, extension arms ,projecting from the counterweighted arms, and rocker cams engaging the extension arms. 11. ln a machine for drilling dowely holes in sash members, a supporting frame, a pair of housings on said frame, drills upon each of said housings, and in alined position to each other, drills upon the housings at right angles to said alined drills, a feed raclr adapted to supply work to the aliiied drills, a feed rack adapted to supply work to the second-named drills, means for locking the worlr delivered to the alined drills during the drilling operation, andV alternately acting means for locking the work delivered to the second-named drills during their 'drilling operation.

12. In a machine for drilling dowel holes in sash members, a supporting frame, a pair of housings on said frame, a set of drills operatively mounted within said housings, vertical feed racks secured to the housings and adapted to receive a stack of sash mem.- bers, a drilling platform adjacent the feed racks, and a rocker arm and feed bar adapted to deliver one sash member from the bottom of the feed raclrs to the drilling platform and lower the stack; so that a stack of sash members may be placed in the feed raclrs andthe lower sash member fed to the drilling platform to be operated upon by the drills, and the remaining sash members lowered. l

13. In a machine for drilling dowel holes in sash members, a supporting frame, a pair of housings on said frame, sets of drills op-V eratively mounted within said housings, vertical feed racksadapted to receive a stack of sash members, a drilling platform adjacent the lower end of therstaclr space and adjacent the drills, means for feeding the lower sash member from the stack to the 'n platform to be operated upon by the drills, vertically swinging counterweighted arms pivotcd at the rear of the housings and having presser plates to press the sash member upon the drilling platform and havingangles to engage' againstl the ends 0f the sash member and against-fthe forward edge, and means for operating the counterweighted arm-s;

Y 14:. Ina machine for drilling dowel holes in sash members, a set of intermittently moving drills, yfeed racks disposed adjacent thereto, al feed bar horizontally reciprocated to feed work from'thefraclrs to a p0- sition inthe path of travel of the drills, a rocker arm pivotally connected to the feed bar, means whereby the arm may befreciprocably moved through aV vertical plane, and means for causing the rocker arm to raise and lower the outer end of the feed bar as said bar is reciprocated, whereby a piece of worlr maybe fed to the drills and the remaining work lowered to thefloor of the feed raclrs without jar. f

15. ln a machine for drilling'dowel holes in sash members, `a set of intermittently feeding drills, a drilling platform inl oppo sition to the drills, verticalV feed raclrs adjacent the platformand adapted to receive a stack of sash members, a horizontal guide'- way on a level with the drilling platform, a feedl bar sliding upon the guide-way, and

a rocker arm for raising and loweringthefeed'bar and reciprocating the feed bar; so that the feed bar willV advance the lower sash member to the drilling platform,then lower the stack, andthen retreat to get behind the next sash member.

16. In a machine for drillingdowel holes in sash members, intermittently yoperating 12o drills, feed raclrsdisposed adjacent thereto and adapted to receive pieces of work superimposed one upon the other, feed means for forcing the lowermost piece of work Voin the racks and into the path of travel of the i drills while the drills are in their inoperative positions, vertically swinging coun- .terweighted armspivotally mounted yand having presser plates to engage onv top of the Work and having angles to engage against the ends and forward edge of the Work, and means for operating the counter- Weighted arms.

17. In a machine for drilling dovvel holes in sash members, a set of feed racks adapt ed to receive superimposed pieces of Work, a Set of feed racks adjacent thereto adapted to receive other superimposed pieces of Work, a feed bar reeiprocated between said racks to alternately discharge the lowermost piece of work from each rack, a counterweight arm7 means whereby the counterweight arm Will be swung into engagement with a piece of Work fed from one feed rack, a looking` lug' adapted to be swung into lockingengagement with the piece of Work fed from the other feed rack, and means whereby the feed bar may be vertically swung to lower the Work within the feed rack to the floor thereof as a piece of Work is being fed therefrom.

In testimony whereof I have signed my name to this specification.

CLARENCE E. LoYD.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

